Apparatus for cutting valve stems



Patented Aug. 7, V19.28.

1,679,977 *Piuma-Fes;

WILLIAM s; KNUnsnn or nnrnorr, MICHIGAN, assienon To GENERAL morons con`ronA'rIoN; or DETROIT, Minnie-AN, A conronsfrionorDELAWARE..y

APPARATUS FOR CUTTING VALVE SIEIVIIS.`

i Griginal application led April 2, 1925J Serial 1\To -20,165.-lDivided` and this application filed February,

The present invention relates to a process of making headed articles, i.e., articles consisting of a more or less slender shank or spindleprovided at one end with a head or portion of a greater lateraldimension. It relates particularly to the manufacture of poppet valves,bolts, screws, and the like.

The present application is a division of my application for poppetvalves, filed April 2, 1925, Ser. No. 20,165. That application isdirected to the valve making process. ri`his application aims to secureprotection on an apparatus used in connection with the process. 4 j

The present process is one of extrusion and comprises, broadly, theproduction in one operation of a head and shank of the proper sizes,requiring only the finishing step of surfacing by grinding or otherwise.

After the making of the valve by the process of extrusion, as explainedin my c0- pending application above referred to, the valve stem must becut to the desired length and this application is more particularlyconcerned with the apparatus to accomplish this result.

Figure 1 is an elevation ofthe cutting oft' mechanism with the coverplate removed.

Figure 2 is a sectional 'View of the same on line 22 of Figure 1.

After the valve or its equivalent, designated in Figure 2 as 21, isformed by the extrusion process, it is then cut olf to the proper lengthin a machine such as is shown in the drawing. In this machine, a member5() serving as a double gear and also as a locater and holder for valve21, is provided with a longitudinal passage 51 for the valve 21 and uponits periphery with the two gears 52 and 53. Gear 52 is driven from asuitable source of power through rack 54 while gear 53 drives two otherracks 55 and 56. These racks 55 and 56 carry respectively a knife 57 andan anvil 58. When power is applied to rack 54 to rotate member 50, theknife 57 will move over the valve 21 and, as the knife edge slopes asshown, will cut off the end of valve 21, anvil member 58 moving insynchronism with the knife and supporting the piece during the cut.

After the stem is cut to the desired length, it may be provided with theusual openings and finished for use in the usual manner.

Seria1 No. 86,553.

I claim;v I j 1. An apparatus for cuttingA oit the stem of a valve, orthe like, comprising means for rotating said stem including a carrierprovided with a pinion and a rack engaging said pinion, cutting means,and mechanism for reciprocating said cutting means simultaneously withthe actuation of said iirst named rotating means.

2. An apparatus for cutting off the stems of valves, or the like,comprising a rotatably mounted member carrying thestem projectingtherefrom, cutting means including a cutting member and an anvil mountedfor opposite reciprocating movements adjacent the projecting end of thestem, means to rotate the carrier and simultaneously reciprocate thecutting means.

3. An apparatus for cutting off a stem comprising a frame, a carrierrotatably mounted therein, the carrier having an axial opening throughand beyond which the stem may project, a pair of reciprocating membersfor cutting the stem adjacent the end of the carrier from which the stemprojects, cooperating means on the carrier and cutting members tooppositely reciprocate the latter upon rotation of the carrier.

Il. An app-aratus for cutting the stem valve, or the like, comprising aframe, a rack reciprocating therein, a stem carrier rotatably mounted inthe frame having a pinion engaging the rack, the stem carrier having anaxial aperture through and beyond which the stem extends, a pair ofcooperan ing members for cutting the stem, mounted for reciprocation inthe frame adjacent the projecting end of the stem, a second pinion onthe carrier and rack teeth on eachmember cooperating with the secondpinion of the carrier whereby reciprocation of the actuating rackrotates the carrier and oppositely reciprocates the members to cut thestem carried by the stem carrier.

5. apparatus for cutting a valve stem comprising a carrier mounted forrotation and carrying a stem projecting axially therebeyond, membersmounted to reciprocate transversely of the axis of the carrier, anddiametrically engaging the projecting stem one member being in the formof an anvil, the other having a sloping knife edge, means to rotate thecarrier and simultaneously and oppositely reciprocate the anvil andknife members whereby the movement of the first mentioned rack rotatesthe carrier and oppo* sitely reciprocates the anvil and knife to cut thestem.

7. In a stem cutting machine, a double pinion rotatable stem carrierhaving a driven and a driving pinion, means engaging the driven pinionto rotate the carrier, and cutting means driven by the driving 'pinionto cut the stem. i

In testimony whereof I ax my signature.

W. S. KNUDSEN.

